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Commit b7e2ac61 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: pci: Disable MWI and make pci_dma_burst_advice() a bit more accurate. 



None of the SH PCI controllers support MWI, it is always treated as a
direct memory write, so simply disable it outright. In the case of the
PCI cache line size, consult that for the pci_dma_burst_advice()
strategy, and switch over to PCI_DMA_BURST_MULTIPLE, as PPC64.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d076d2bd

arch/sh/include/asm/pci.h

+18 −2
Original line number Diff line number Diff line
@@ -89,12 +89,28 @@ static inline void pcibios_penalize_isa_irq(int irq, int active) 
#endif



#ifdef CONFIG_PCI

/*

 * None of the SH PCI controllers support MWI, it is always treated as a

 * direct memory write.

 */

#define PCI_DISABLE_MWI



static inline void pci_dma_burst_advice(struct pci_dev *pdev,

					enum pci_dma_burst_strategy *strat,

					unsigned long *strategy_parameter)

{

	*strat = PCI_DMA_BURST_INFINITY;

	*strategy_parameter = ~0UL;

	unsigned long cacheline_size;

	u8 byte;



	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);



	if (byte == 0)

		cacheline_size = L1_CACHE_BYTES;

	else

		cacheline_size = byte << 2;



	*strat = PCI_DMA_BURST_MULTIPLE;

	*strategy_parameter = cacheline_size;

}

#endif